[gdal-dev] Fast Pixel Access

[David Baker (Geoscience)]

Dev's,

I have a set of 55,501 bil files in a single directory.  They are DEMS data that cover the US in 7.5 minute tiles.  I would like to randomly access elevations at a given lat/lon's from the whole dataset.  I created a vrt file from the directory of bil files, and have been able to access the elevation at a given lat/lon using gdallocationinfo, but because of the size of the dataset, this operation is somewhat slow.  Can the vrt be indexed? Or, is there a faster, better way to access the pixels?  I would first like to do this with the utilities before diving into code (C#).  The files are regularly named base on their location within a 1 arc-second grid.

Thanks,
David

David M. Baker
Senior Advisor - Geoscience Technology
Chesapeake Energy Corporation
david.m.baker at chk.com<mailto:david.m.baker at chk.com>


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